How do I keep my texture when making my object low poly?
I've never used Adobe Fuse, but you can keep the high poly texture and use it to the low poly with the baking technique. After you unwrap the low poly model, just create a new blank texture in the UV/Image Editor. Make sure you have a material for the high poly with all needed textures, and another material for the low poly. In this material, add a texture image node (you don't have to connect it to another node, just create and place it) and choose the empty texture you created before.



Using Cycles, set the Bake Type to Diffuse (or any other property of the high poly's shader, if you need it) and active the Selected to Active checkbox. Click the high poly object first, then the low poly and eventually click Bake. 



The texture you created before now contains information (the diffuse color in my example), and you can use it in the material of the low poly object (just connect the image texture node you created before to the shader node you need).